<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>
		
	<script>
				
				// 1. while
				var i=0
				while(i<5)
				{
					document.write("<h3>Hello world</h3>")
					i++
				}
				
				// 2. do-while
				var j=0
				do{
					document.write("<h3 style='color:red'>Javascript</h3>")
					j++
				}while(j<5)
				
				// 3. for语句
				for(var k=0;k<5;k++)
				{
					document.write("<h3 style='color:green'>for语句</h3>")
				}
				</script>
		<h1>乘法口诀表</h1>
				<script>
					document.write("<pre>");
					for(var i=1;i<=9;i++)
					{
						for(var j=1;j<=i;j++)
						{
							document.write(j+"*"+i+"="+(i*j)+"\t");
						}
						document.write("\n");
					}
					document.write("</pre>");
			</script>
	</body>
</html>
